21012091733393 has 2 divisors, whose sum is σ = 21012091733394. Its totient is φ = 21012091733392.

The previous prime is 21012091733389. The next prime is 21012091733429. The reversal of 21012091733393 is 39333719021012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17112841212289 + 3899250521104 = 4136767^2 + 1974652^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012091733393 - 2² = 21012091733389 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012091732393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506045866696 + 10506045866697.

It is an arithmetic number, because the mean of its divisors is an integer number (10506045866697).

Almost surely, 2^{21012091733393} is an apocalyptic number.

It is an amenable number.

21012091733393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012091733393 is an equidigital number, since it uses as much as digits as its factorization.

21012091733393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 44.

The spelling of 21012091733393 in words is "twenty-one trillion, twelve billion, ninety-one million, seven hundred thirty-three thousand, three hundred ninety-three".